Archipelago » qemu

/*

 * QEMU TCX Frame buffer

 * 

 * Copyright (c) 2003-2005 Fabrice Bellard

 * 

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "vl.h"

#define MAXX 1024

#define MAXY 768

#define TCX_DAC_NREGS 16

typedef struct TCXState {

    uint32_t addr;

    DisplayState *ds;

    uint8_t *vram;

    unsigned long vram_offset;

    uint16_t width, height;

    uint8_t r[256], g[256], b[256];

    uint8_t dac_index, dac_state;

} TCXState;

static void tcx_screen_dump(void *opaque, const char *filename);

static void tcx_draw_line32(TCXState *s1, uint8_t *d, 

                            const uint8_t *s, int width)

{

    int x;

    uint8_t val;

    for(x = 0; x < width; x++) {

        val = *s++;

        *d++ = s1->b[val];

        *d++ = s1->g[val];

        *d++ = s1->r[val];

        d++;

    }

}

static void tcx_draw_line24(TCXState *s1, uint8_t *d, 

                            const uint8_t *s, int width)

{

    int x;

    uint8_t val;

    for(x = 0; x < width; x++) {

        val = *s++;

        *d++ = s1->b[val];

        *d++ = s1->g[val];

        *d++ = s1->r[val];

    }

}

static void tcx_draw_line8(TCXState *s1, uint8_t *d, 

                           const uint8_t *s, int width)

{

    int x;

    uint8_t val;

    for(x = 0; x < width; x++) {

        val = *s++;

        /* XXX translate between palettes? */

        *d++ = val;

    }

}

/* Fixed line length 1024 allows us to do nice tricks not possible on

   VGA... */

static void tcx_update_display(void *opaque)

{

    TCXState *ts = opaque;

    uint32_t page;

    int y, page_min, page_max, y_start, dd, ds;

    uint8_t *d, *s;

    void (*f)(TCXState *s1, uint8_t *d, const uint8_t *s, int width);

    if (ts->ds->depth == 0)

        return;

    page = ts->vram_offset;

    y_start = -1;

    page_min = 0x7fffffff;

    page_max = -1;

    d = ts->ds->data;

    s = ts->vram;

    dd = ts->ds->linesize;

    ds = 1024;

    switch (ts->ds->depth) {

    case 32:

        f = tcx_draw_line32;

        break;

    case 24:

        f = tcx_draw_line24;

        break;

    default:

    case 8:

        f = tcx_draw_line8;

        break;

    case 0:

        return;

    }

    for(y = 0; y < ts->height; y += 4, page += TARGET_PAGE_SIZE) {

        if (cpu_physical_memory_get_dirty(page, VGA_DIRTY_FLAG)) {

            if (y_start < 0)

                y_start = y;

            if (page < page_min)

                page_min = page;

            if (page > page_max)

                page_max = page;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

            f(ts, d, s, ts->width);

            d += dd;

            s += ds;

        } else {

            if (y_start >= 0) {

                /* flush to display */

                dpy_update(ts->ds, 0, y_start, 

                           ts->width, y - y_start);

                y_start = -1;

            }

            d += dd * 4;

            s += ds * 4;

        }

    }

    if (y_start >= 0) {

        /* flush to display */

        dpy_update(ts->ds, 0, y_start, 

                   ts->width, y - y_start);

    }

    /* reset modified pages */

    if (page_max != -1) {

        cpu_physical_memory_reset_dirty(page_min, page_max + TARGET_PAGE_SIZE,

                                        VGA_DIRTY_FLAG);

    }

}

static void tcx_invalidate_display(void *opaque)

{

    TCXState *s = opaque;

    int i;

    for (i = 0; i < MAXX*MAXY; i += TARGET_PAGE_SIZE) {

        cpu_physical_memory_set_dirty(s->vram_offset + i);

    }

}

static void tcx_save(QEMUFile *f, void *opaque)

{

    TCXState *s = opaque;

    qemu_put_be32s(f, (uint32_t *)&s->addr);

    qemu_put_be32s(f, (uint32_t *)&s->vram);

    qemu_put_be16s(f, (uint16_t *)&s->height);

    qemu_put_be16s(f, (uint16_t *)&s->width);

    qemu_put_buffer(f, s->r, 256);

    qemu_put_buffer(f, s->g, 256);

    qemu_put_buffer(f, s->b, 256);

    qemu_put_8s(f, &s->dac_index);

    qemu_put_8s(f, &s->dac_state);

}

static int tcx_load(QEMUFile *f, void *opaque, int version_id)

{

    TCXState *s = opaque;

    if (version_id != 1)

        return -EINVAL;

    qemu_get_be32s(f, (uint32_t *)&s->addr);

    qemu_get_be32s(f, (uint32_t *)&s->vram);

    qemu_get_be16s(f, (uint16_t *)&s->height);

    qemu_get_be16s(f, (uint16_t *)&s->width);

    qemu_get_buffer(f, s->r, 256);

    qemu_get_buffer(f, s->g, 256);

    qemu_get_buffer(f, s->b, 256);

    qemu_get_8s(f, &s->dac_index);

    qemu_get_8s(f, &s->dac_state);

    return 0;

}

static void tcx_reset(void *opaque)

{

    TCXState *s = opaque;

    /* Initialize palette */

    memset(s->r, 0, 256);

    memset(s->g, 0, 256);

    memset(s->b, 0, 256);

    s->r[255] = s->g[255] = s->b[255] = 255;

    memset(s->vram, 0, MAXX*MAXY);

    cpu_physical_memory_reset_dirty(s->vram_offset, s->vram_offset + MAXX*MAXY,

                                    VGA_DIRTY_FLAG);

    s->dac_index = 0;

    s->dac_state = 0;

}

static uint32_t tcx_dac_readl(void *opaque, target_phys_addr_t addr)

{

    return 0;

}

static void tcx_dac_writel(void *opaque, target_phys_addr_t addr, uint32_t val)

{

    TCXState *s = opaque;

    uint32_t saddr;

    saddr = (addr & (TCX_DAC_NREGS - 1)) >> 2;

    switch (saddr) {

    case 0:

        s->dac_index = val >> 24;

        s->dac_state = 0;

        break;

    case 1:

        switch (s->dac_state) {

        case 0:

            s->r[s->dac_index] = val >> 24;

            s->dac_state++;

            break;

        case 1:

            s->g[s->dac_index] = val >> 24;

            s->dac_state++;

            break;

        case 2:

            s->b[s->dac_index] = val >> 24;

        default:

            s->dac_state = 0;

            break;

        }

        break;

    default:

        break;

    }

    return;

}

static CPUReadMemoryFunc *tcx_dac_read[3] = {

    tcx_dac_readl,

    tcx_dac_readl,

    tcx_dac_readl,

};

static CPUWriteMemoryFunc *tcx_dac_write[3] = {

    tcx_dac_writel,

    tcx_dac_writel,

    tcx_dac_writel,

};

void tcx_init(DisplayState *ds, uint32_t addr, uint8_t *vram_base,

              unsigned long vram_offset, int vram_size, int width, int height)

{

    TCXState *s;

    int io_memory;

    s = qemu_mallocz(sizeof(TCXState));

    if (!s)

        return;

    s->ds = ds;

    s->addr = addr;

    s->vram = vram_base;

    s->vram_offset = vram_offset;

    s->width = width;

    s->height = height;

    cpu_register_physical_memory(addr + 0x800000, vram_size, vram_offset);

    io_memory = cpu_register_io_memory(0, tcx_dac_read, tcx_dac_write, s);

    cpu_register_physical_memory(addr + 0x200000, TCX_DAC_NREGS, io_memory);

    graphic_console_init(s->ds, tcx_update_display, tcx_invalidate_display,

                         tcx_screen_dump, s);

    register_savevm("tcx", addr, 1, tcx_save, tcx_load, s);

    qemu_register_reset(tcx_reset, s);

    tcx_reset(s);

    dpy_resize(s->ds, width, height);

}

static void tcx_screen_dump(void *opaque, const char *filename)

{

    TCXState *s = opaque;

    FILE *f;

    uint8_t *d, *d1, v;

    int y, x;

    f = fopen(filename, "wb");

    if (!f)

        return;

    fprintf(f, "P6\n%d %d\n%d\n", s->width, s->height, 255);

    d1 = s->vram;

    for(y = 0; y < s->height; y++) {

        d = d1;

        for(x = 0; x < s->width; x++) {

            v = *d;

            fputc(s->r[v], f);

            fputc(s->g[v], f);

            fputc(s->b[v], f);

            d++;

        }

        d1 += MAXX;

    }

    fclose(f);

    return;

}